Range-indicating mechanism.



A. T. DAWSON m. T. BUCKHAM.

' Patehted Nov. 23, 1915.

RANGE INDICATING MECHANISM.

APPLlCATION FILED MAYI3.1913.

a; MJi/WM UNITED STATES arana Fries.

ARTHUR TREVOR DAWSON AND GEORGE THOMAS ZBUCKHAM, (3F WESTMINSTER,

LONDON, ENGLAND, ASSIGNORS T VICKEBS LIMITED, 0} IVESTMINSTER, ENG- LAND.

HAM, both subjects of the King of Great l'o' following is a specification.

Britain, residing at Vickers House, Broadway, Westminster, in the county of London, England, have invented certain new and useful Improvements in or Relating to Range-Indicating Mechanism, of which the This invention relatesto range indicating mechanism of the kind for use with ordnance firing at high angles of elevation in which a cam is employed for controlling themovements of thepointer of th range dial or drum. the surface of this cam being composed of a number of curves based on the firing angles for various altitudes of the object aimed at. g

According to this invention we so construct and arrange the range indicating mechanism that the aforesaid cam for controlling the pointer of the range dial or drum is disposed some distance from the trunnions instead of in alineinent therewith as in the devices heretofore proposed by us. For this purpose the range dial or drum may be situated on the right hand side of the gun and may be operated from the main shaft of the ranging gear by suitable gearing, the whole of this gearing together with the cam being carried on a bracket or casing which is preferably pivoted in a position co-axial with the trunnions.

In order that the'said invention may be clearly understood and readily carried into effect we will describe the same more fully with reference to the accompanyingdrawin s, in which "igure 1 is a side elevation of a gun mounting showing a form of range indicating mechanism constructed in accordance withour invention. Fig. 2 is a side elevation? Fig. 3 is a section on line 1-1 of Fig. 2 showing the range indicating mechanism on an enlarged scale. Fig. 4 is a View similar to Fig. 2 with the range d a removed.

In these figures, G represents an extension of one of the gun trunnions, G the range dial or drum and G its pointer.

H represents the cam for controlling the movements of the pointer and H the bracket or casing pivoted co-axially with the RANGE-INDICAT IN MECHANISM.

Specification of Letters Patent.

trunnion.

and worm gearing Patented nevi as, rent.

A ncaatn filed May 13, ms. Serial n0. 767,267.

J represents the carried by the said bracket. In the example shown the movablepointer if is rigidly mounted on the boss is of a pinion g loosely mounted on a boss the range dial G, the latter in turn being ranging shaft H and adapted to be driven by the bevel Z shown in Figs. 2 and from the ranging shaft J. The said pinion 9 gears with a quadrant G pivotally mounted at (Fig. 2) to the bracket H. The said quadrant G is formed with a lever G carrying a roller 9 which is kept in con tact "with the aforesaid cam H bymeansbf a suitabie tension spring 37 attached to a wire m which coils upon the boss of the pinion 9 The said cam H which is preferably ar igec. as shown to the front of the gun trunni n formed with internal screw threads which en are with threads formed on a hollow Y supported in a bearing h on the bracket H. The said hollow screw is prbvided with a bush it having a hexagonal outer end it upon which. the cam H can slide but cannot turn. The said screw has secured to it a spur wheel ]L2 which engages with a quadrant H adjustably secured to the gun carriage, by means of the screw and nut arrangement H 2.) The said bush it has secured to its inner end a spur wheel it which engages with a quadrant 71/ pivoted on the extension G of the "gun trunnions by means of the rod H pivoted to the quadrant and connected to a part that moves during pointing W hen. the gun moves during pointing, the whole gear is displaced with the exception of the quadrant H appertaining to the hollow screw iii (the said quadrant being as aforesaid connected to the gun carriage) andthe said screw owing to the engagement of its pinion it with the quadrant H thus receives a relative rotary displacement which effects an axial movement of the can! i-Lthe latter being prevented from rotating by the bush h s. is in the example illustrated g of v n I n attached to a spindle 9 carried in the bracket that pinion h gearingwith the-said quad ant it is angularly displaced together with the hush k, the screw H, and the cam. H; hence the cam is displaced axially during pointing andangularly during ranging. 'ihe contour oi the cam is so designed as to give the necessary correction to the pointer (i during these'movements. lihe range diai may be so constructed that it can be easily removed and replaced when desired,

i r'hat we claim and desire to secure by Letters li ateiilt of the United States is l. in ran indicating mechanism for ordnan 2, the combination with two members co i tnting a range indicator, of a bracket pi oted crmxially with the gun trunnions and carrying said members, a cam mounted on fhiliijl bracket for controlling the movemcr at one member of said indicator, and a pivot for said cam arranged on said bracket some distance from. the gun trunnion.

23. in rangeindicating mechanism for ordiii].l1f ,t",bil0 .:oml )ination with arrange dial and its ioiiitrr constituting a range indicator, of a Market pivot-ally coatiially with the gun trunnions and carrying the range indicator, a cam mounted on said bracket for control hug the movements of said pointer, a pivot said. cam arranged on said bracket some distance from the gun trunnion, means for axially moving the said cam during the pointing of the gun, and means to angulariy moving said cam during the ranging oi the gen,

1? In range indicating mechanism for ordthe coi'nbini. ion with a range dial its pointer coi sitnting a range indibracket pivoted coaxially with n trnnnionsand carrying the range indicator, a cam mounted on said. bracket for controlling the movements of said pointer, a pivot for said cam arranged on said bracket some distance from the gun trunnion, a toothed member geared with said pointer, a part of said member bearing on the cam, a hollow screw engaging with internal screw threads on said cam, a bush for said hollow screw, a spur wheel secured to said screw, a toothed member secured to the gun carriage and gearing with said spur wheel on said bush, and a toothed member moving only during the pointing of the gun and gearing with the last mentioned spur wheel.

4. In range indicating mechanism for ordnance, the combination with a range dial and its pointer constituting a range indicator, of a'bracket pivoted coaxially with the gun trunnions and carrying the range indicator, a cam mounted on said bracket for controlling the movements of said pointer, a pivot for said cam arranged on said bracket some distance from the gun trunnion, a quadrant geared with said pointer, a part of said quadrant bearing on the cam, a hollow sore engaging with internal screw threads on said cam, a bush for said hollow screw, a spur wheel secured to said screw, a quadrant secured to the gun carriage and gearing with said spur wheel, a spur wheel on said bush, and a quadrant moving only during the pointing of the gun and gearing with the last mentioned spur Wheel.

In testimony whereof we aiiixrour signatures in presence of two witnesses. it

ARTHUR I.REVOR DAWSON. GEORGE THOMAS BUGKHA M Witnesses .Hnnnr Kins,

Jno. R. CAswnLL. 

